If you want proof of how quickly time is passing, all you really need to do is take a peek into the world of celebrities. Earlier this month, NSYNC—the singing group that launched a thousand which-boy-band-reigns-supreme fights back in the day—had a reunion at JC Chasez' 40th birthday. Another example is the fact that these 12 child stars are all grown up, even though it seems like just yesterday that they were gracing our TV and movie screens as their younger selves. Now, the newest time-is-flying-by wakeup call comes courtesy of Reese Witherspoon, who posted a photo of her daughter Ava Phillippe on Instagram over the weekend to celebrate Ava's 17th birthday.

Yes, you heard that right—Reese Witherspoon's daughter is 17. What's more, Phillippe looks basically just like her mom did while taking Harvard Law by storm as Elle Woods and dropping gems like, "Whoever said orange was the new pink is seriously disturbed." If you didn't check the caption of the photo, it could have seemed like Witherspoon was posting a throwback of her own teenage years. The Witherspoon genes are clearly strong (and gorgeous, which doesn't hurt).

Make no mistake, this isn't the first time this mom and daughter pair has twinned on Instagram. Back in July, Witherspoon posted a selfie with her daughter that showed how alike they look. But since this post was to mark Phillippe's birthday, the spotlight was all on her. Check it out below.